[英]SQL Pivoting in Teradata
我需要將行轉換為多個輸出列。
我有2個表,我需要合並並生成保存在此處的第三個表。
CREATE MULTISET TABLE TAG
( TAG VARCHAR(100),
ID VARCHAR(100)
) PRIMARY INDEX (TAG,ID);
INSERT INTO TAG VALUES('L2250','I14299');
INSERT INTO TAG VALUES('L2250','I14300');
INSERT INTO TAG VALUES('L2250','I14301');
CREATE MULTISET TABLE IDS
( ID VARCHAR(100),
TYPE VARCHAR(100),
DESCR VARCHAR(100)
) ;
INSERT INTO IDS VALUES ('I14299','Exposure','Bills');
INSERT INTO IDS VALUES ('I14299','Exposure','Certificates');
INSERT INTO IDS VALUES ('I14299','Exposure','NCDS');
INSERT INTO IDS VALUES ('I14300','Currency','GB');
INSERT INTO IDS VALUES ('I14300','Currency','AU');
INSERT INTO IDS VALUES ('I14301','Rate','NOT FIXED');
INSERT INTO IDS VALUES ('I14301','Rate','FIXED');
既不是樞軸也不是樞軸,您要創建不同類型的所有可能組合:
SELECT *
FROM
( SELECT t.tag, i.descr AS I14299
FROM tag AS t JOIN ids AS i
ON t.id = i.id
WHERE i.id = 'I14299'
) AS e
CROSS JOIN
( SELECT descr AS I14300
FROM ids
WHERE id = 'I14300'
) AS c
CROSS JOIN
( SELECT descr AS I14301
FROM ids
WHERE id = 'I14301'
) AS r
如果您需要對其他標簽執行此操作,則可以切換到:
SELECT e.*, c.descr, r.descr
FROM
( SELECT t.tag, i.descr AS I14299
FROM tag AS t JOIN ids AS i
ON t.id = i.id
WHERE t.id = 'I14299'
) AS e
JOIN
( SELECT t.tag, descr AS I14300
FROM tag AS t JOIN ids AS i
ON t.id = i.id
WHERE t.id = 'I14300'
) AS c
ON e.tag = c.tag
JOIN
( SELECT t.tag, descr AS I14301
FROM tag AS t JOIN ids AS i
ON t.id = i.id
WHERE t.id = 'I14301'
) AS r
ON e.tag = r.tag
當然,這會對ID進行硬編碼,如果要動態創建ID,則需要在存儲過程中使用動態SQL。
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